Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
Easter Island is an island in what ocean?
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Which U.S. state has "The Ocean State" as its nickname?
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Approximately how long is the gestation period for a blue whale calf?
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The Chinese white dolphin can be what color?
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Which species is known as the Devilfish?
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What type of breeze rushes from the ocean to the land?
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How many chambers do the hearts of sperm whales have?
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What does ocean thermal gradient mean?
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